I’m having a really hard time

This past week has been terrible. Completely terrible in every way. I feel so alone. I feel unwanted. Sometimes I get so upset I feel sick. I see all these people and my friends who have great relationships with their parents, they’re married to the loves of their lives..I’m not saying theyre perfect or don’t have problems..I just want to feel loved too.
Every girl I talk to tricks me and says they like me and want to be with me and then turns around and says they don’t want me at all. Or I get stood up. Or they just don’t respond. I don’t know what I’m doing wrong or what’s wrong with me to make me so undesirable. I really try to me a good person and treat people well.
I’ve never wanted to kill myself, or even thought about it. This week I was thinking about what would happen if I just wasn’t here. Because this feeling, the emptiness throughout my entire body has to stop, I don’t know what to do.